Motor Performance Fine Tuning; Motor Performance Fine Tuning; Parameters For Tuning The Drive; Motor Hunting And Oscillation Control Parameters - YASKAWA J1000 Technical Manual

6.2 Motor Performance Fine Tuning

6.2

Motor Performance Fine Tuning

This section offers helpful information for counteracting oscillation, hunting, or other faults that occur while performing a
trial run.
Note: This section describes parameters that are commonly edited. Consult Yaskawa for more information on detailed settings and fine-tuning
the drive.
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Parameters for Tuning the Drive

Problem
• Motor hunting and
oscillation at speeds between
10 and 40 Hz
• Motor noise
• Motor hunting and
oscillation at speeds up to 40
Hz
• Poor motor torque at speeds
below 10 Hz
• Motor hunting and
oscillation
• Poor motor torque at low
speeds
• Motor instability at motor
start
• Poor speed precision
Note: Use slip compensation to improve speed precision. First make sure that the proper values have been set for the motor rated current to E2-01,
motor rated slip (E2-02), and motor no-load current (E2-03). Next, adjust the slip compensation gain set to C3-01 so that it is between 0.5
to 1.5.
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Motor Hunting and Oscillation Control Parameters

The following parameters indirectly affect motor hunting and oscillation.
Name (Parameter No.)
Accel/Decel Time (C1-01 through C1-09)
S-Curve Characteristics (C2-01 through
C2-04)
Jump Frequency (d3-01 through d3-04) Skips over the resonant frequencies of connected machinery.
Analog Filter Time Constant (H3-13)
Stall Prevention (L3-01 through L3-06)
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Table 6.1 Parameters for Tuning the Drive
Parameter
• If insufficient motor torque relative to the size of the load
causes hunting, reduce the setting.
• When motor hunting and oscillation occur with a light load,
Hunting Prevention
increase the setting.
Gain (n1-02)
• Lower this setting if hunting occurs when using a motor
with a relatively low inductance, such as a high-frequency
motor or a motor with a larger frame size.
• If the motor noise is too loud, increase the carrier
frequency.
• When motor hunting and oscillation occur at speeds up to
Carrier Frequency
40 Hz, lower the carrier frequency.
Selection (C6-02)
• The default setting for the carrier frequency depends on the
drive capacity (o2-04) and the Drive Duty Selection
(C6-01).
• If motor torque is insufficient at speeds below 10 Hz,
increase the setting.
Torque Compensation
Gain (C4-01)
• If motor hunting and oscillation with a relatively light load,
decrease the setting.
• If torque is insufficient at speeds below 10 Hz, increase the
setting.
Mid Output Voltage A
(E1-08) • If motor instability occurs at motor start, decrease the
Minimum Output setting.
Voltage (E1-10)
Note: The recommended setting value is for 200 V class
drives. Double this value when using a 400 V class drive.
• After setting the motor-rated current (E2-01), motor-rated
Slip Compensation
slip (E2-02) and motor no-load current (E2-03), adjust the
Gain (C3-01)
slip compensation gain (C3-01).
Table 6.2 Parameters that Affect Control Performance in Applications
Adjusting accel and decel times will affect the torque presented to the motor during acceleration or
deceleration.
Prevents shock at the beginning and end of acceleration and deceleration.
Prevents fluctuation in the analog input signal due to noise.
• Prevents motor speed loss and overvoltage. Used when the load is too heavy and also during sudden
acceleration/deceleration.
• Adjustment is not normally required because Stall Prevention is enabled as a default. Disable Stall
Prevention during deceleration (L3-04 = "0") when using a braking resistor.
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Corrective Action
Application
YASKAWA ELECTRIC SIEP C710606 31B YASKAWA AC Drive – J1000 Technical Manual
Default Suggested
Value Setting
1.00 0.00 to 2.00
7 (Swing
1 to 7
PWM)
1.00 0.50 to 1.50
E1-08:
18.4 V
Initial value ±5 V
E1-10:
13.8 V
- 0.5 to 1.5